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Description
Murad Sarsour is inviting you to a scheduled ZoomGov meeting.
Topic: Epic Barrel HCal
Time: This is a recurring meeting Meet anytime
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Meeting ID: 161 050 1083
Passcode: 040716
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Meeting ID: 161 050 1083
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Meeting ID: 161 050 1083
Passcode: 040716
Minutes BHCal meeting, 4/25/25, compiled by Anjaly
HCal PROTOTYPE STATUS AND PLANS:
• No confirmation yet on the arrival of tiles. (Stefan will check and inform Murad if they have arrived at BNL.)
• Discussion of the LED system: (Since Steve was not present, it was agreed that a detailed discussion should wait.)
• Stefan: The key question is whether we want to adopt Steve’s suggestion. (Placing LEDs next to SiPMs could introduce noise, so Steve suggests placing LEDs in the electronics box at the sector center and delivering the light to the tiles via fibers. If we choose this approach, we have to assess our ability to engineer or redesign the system and modify the upstream distribution.)
• Hamlet: The LED system can be used to control and monitor the detector status over time, perform gain calibration, and check the impact of accumulated radiation dose. The system could follow models like CMS (CERN) or GLUEX (JLab).
• Norbert: Noted that whether the LED is placed next to the SiPM is a detector design issue, not an electronics issue. This decision needs to be made by the detector team.
• Norbert: HGCROC will drive the LED in combination with another chip (?) capable of generating a small pulse with variable voltages. A major advantage is synchronization with the clock.
• Murad: Commented on GSU analysis using LED runs and cosmics. Mentioned discussions with Eric, Stefan, and Martin about cooling, radiation damage, etc
• Stefan (Summary): The default plan is to build a system where central LEDs are driven by HGCROC, with light distributed to the tiles using existing fibers and therefore requiring no redesign. If this system provides a sign of life for every SiPM tile, it is good. If it enables relative calibration monitoring, that will be even better.
• Martin: Provided an update on the readout. Working with Dan Cacace to develop the box for the system and outlined requirements from Norbert/Miklos regarding networking.
• Eric: Emphasized the importance of mounting the case/box to the prototype to prevent it from falling - an important point to be noted.
• Norbert, Martin: Discussed the importance of unifying the DAQ system. Norbert anticipates it will take about one month to finish the PCB.
SIMULATION:
• Derek: Gave an update on the initial work toward creating a prototype that transitions output from RCDAQ into the ePIC software framework called JANA2.
• Norbert: Requested a cosmic scintillator trigger (TTL output) at BNL to measure the MIP peak using his code. Later, can go with selecting preamps, gains, etc.
Update from Stefan after the meeting:
- The tiles from GSU have still not arrived at Highbay.
- Spoke to John and confirmed that he currently has the scintillator tile with SiPMs.
Update 4/29: tiles just arrived
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